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Proceedings Paper

Ground-based coronagraphy with high-order adaptive optics
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Paper Abstract

We simulate the actions of a coronagraph matched to diffraction-limited adaptive optics (AO) systems on the Calypso 1.2 m, Palomar Hale 5 m and Gemini 8.1 m telescopes, and identify useful parameter ranges for AO coronagraphy on these systems. We model the action of adaptive wavefront correction with a tapered, high-pass filter in spatial frequency rather than a hard low frequency cutoff, and estimate the minimum number of AO channels required to produce sufficient image quality for coronagraphic suppression within a few diffraction widths of a central bright object (as is relevant to e.g., brown dwarf searches near late-type dwarf stars). We explore the effect of varying the occulting image- plane stop size and shape, and examine the trade-off between throughput and suppression of the image halo and Airy rings. We discuss our simulations in the context of results from the 241-channel Palomar Hale AO coronagraph system, and suggest approaches for future AO coronagraphic instruments on large telescopes.

Paper Details

Date Published: 7 July 2000
PDF: 10 pages
Proc. SPIE 4007, Adaptive Optical Systems Technology, (7 July 2000); doi: 10.1117/12.390396
Show Author Affiliations
Russell B. Makidon, Space Telescope Science Institute (United States)
Anand Sivaramakrishnan, Space Telescope Science Institute (United States)
Christopher D. Koresko, California Institute of Technology (United States)
Thomas Berkefeld, Max-Planck-Institut fuer Astronomie (Germany)
Marc J. Kuchner, Palomar Observatory/California Institute of Technology (United States)
Robert S. Winsor, Space Telescope Science Institute (United States)

Published in SPIE Proceedings Vol. 4007:
Adaptive Optical Systems Technology
Peter L. Wizinowich, Editor(s)

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